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SCREENING MECHANISM.

N0.-403,990. Patented May 28, 1889.

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(No Model.) 7 Sheets-Sheet 2. E. B. OOXE 8: S. SALMON.

SCREENING MECHANISM.

No. 403,990. Patented May 28 1889.

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Patented May 28, 1889.

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(No Model.) 7 Sheets-Sheet 4, E, B. GOXE & S. SALMON.

SCREENING MECHANISM.

N0. 403,990. Patented May 28, 1889.

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7 Sheets-Sheet 5. E. B. GOXE & S. SALMON. SCREENING MECHANISM.

Patented May 28, 1889.

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SCREENING MECHANISM. No. 403,990. Patented May 28, 1889..

(NoModeL) 7 Sheets-Shet '2. E. B. OOXE & S. SALMON.

- SCREENING MEGHANISM. No. 403,990. Patented May 28, 1889.

um mumn m UNITED STATES PATENT OFFICE.

EOKLEY B. COXE AND SAMUEL SALMON, OF DRIFTON, PENNSYLVANIA; SAID SALMON ASSIGNOR TO SAID OOXE.

SCREENING MECHANISM.

SPECIFICATION forming part of Letters Patent No. 403,990, dated May 28, 1889.

Application filed June 9, 1887. Serial No. 240,771. (No model.)

To all whom it may concern.-

Be it known that we, ECKLEY B. OOXE and SAMUEL SALMON, of Drift011,in the county of Luzerne, and in the State of Pennsylvania, have invented certain new and useful Improvements in Screening Mechanism; and we do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure 1 is a perspective view of our apparatus as arranged for use. Figs. 2 and 3 are respectively a front and a side elevation of the same. Fig. 4 is a horizontal section upon line a: so of Fig. 2. Figs. 5 and 6 are vertical sections upon lines as 00 and z z of Fig. 4. Fig. 7 is a perspective view, enlarged, of one of the guide-rollers, its pivotal bearing and the engaging portion of the screen-frame separated from each other; and Fig. 8 is a like view of the same combined.

Letters of like name and kind refer to like parts in each of the figures.

The design of this invention is to enable a coal-screen to be gyrated horizontally; and such-invention consists in an improved screening mechanism, as hereinafter specified and claimed.

In the carrying of our invention into practice we preferably employ a base, which in plan View has the general form of the letter H, the parallel ends A and A being adapted to be secured upon supporting-timbers B and B. The cross-bar A, which connects said ends, is extended downward, as shown in Fig. 6, and furnishes bearings for a shaft, 0, to which, at or near its longitudinal center, is attached a belt-pulley, D, while at its upper end, above said cross-bar A, is provided a crank, 0. Upon the upper side, near each corner of the base A, are provided two bearings, E and E, which receive and contain two oppositely-arranged journals, f and f, that are formed upon and constitute portions of an ordinary crossshaped bearing, F, for a universal joint. To the other journals, f and f, of the bearing F is pivoted the forked lower end, 9, of a bar, G, which bar from thence extends upward, and has its upper forked end, g, in a like manner pivoted upon the journals f and f of a second cross-shaped bearing, F, which latter in turn has its journ als f and f contained within two bearings, H and H, that are attached to the side, near one corner, of a rectangular frame, I, the arrangement being such as to cause said frame to be suspended upon said bars and to be capable of horizontal motion in either direction within certain limits.

The frame I is intended for the reception of screens, and may contain any desired number of the same, and such screens may have such arrangement as will best adapt them for the special purpose for which the screening mechanism is designed.

A gyratory motion is given to the screenframe I by means of the crank c, which is journaled within a bearing, K, at the horizontal center of the lower side of said frame, and when rotating with the shaft 0 imparts the desired movement to the frame. The centrifugal action of the latter is neutralized by making the driving-pulley D solid upon the side opposite to said crank, the weight d thus provided being sufficient to counterbalance the throw of said frame and crank. In order that the crank may be relieved from undue strain and the screen-frame prevented from moving circumferentially and its sides and ends caused to maintain their parallelism with the corresponding sides and ends of the base, there is journaled at each corner, upon the upper side of the latter, a roller, L, which is adapted to rotate in a horizontal plane, and preferably is provided at its lower end with a radial peripheral flange, Z. Within the bottom of said screen-frame, immediately over each roller, is provided a circular recess or guide, 2', into which the body of said roller extends, which recess has such diameter as to permit said frame to be moved freely by the crank 0 while maintaining rolling contact between its side and the periphery of said roller.

By the action of the circular guides and their roller-bearings each part of the screenframe is caused to move horizontally in precisely the same path as its center, such movement being gyratory and in no respect circumferential.

\Vhile four guide-rollers are preferably employed, three, or even two, in connection with the driving-crank, will enable the apparatus to be operated. \Vhen three rollers are used,

two should be placed at one end of the screenframe and the third at the center of the op-- posite end. When two rollers are employed, one of the same should be placed at each end.

The suspension of the screen-frame from below, as shown, is preferably employed; but the same result can be secured by placing the suspensory mechanism above the frame, in which event the driving and controlling mechanism could be located at either the bottom of said frame, as shown, or at its upper side.

In the apparatus described the screens have a motion which corresponds nearly to the motion that is given to the hand-screen of a molder, which motion is the most eifective known for quickly and thoroughly screening articles.

Having thus described our invention, what we claim is- 1, In a screening mechanism, the combination, with a supporting-base, of a screen-holding frame provided with horizontal circular guides, vertically-journaled rollers supported by said base and engaging said guides, and a crank engaging said frame and servingto impart circular movements thereto, substantially as and for the purpose specified.

2. In a screening mechanism, the combination, with a supporting-base, of a screen-holding frame provided with horizontal circular vertically-journaled rollers arranged within said recesses and of lesser diameter than the latter, supporting-bars jointed at their lower ends to said base and at their upper ends to said frame, and crank engaging said frame and serving to impart circular movements thereto, substantially as and for the purpose set forth.

3. In a screening mechanism, the combination,with the supporting-base A, of the screen- 3O recesses, the walls of which serve as guides, 

